Guard for cutter-heads



(No Model.)

. I. E. HALL.

GUARD FOR CUTTER HEADS.

No. 337,493. Patented Mar. 9, 1886.

C ime/whoa wi/bmoo m rran STATES ISAAC E. HALL, OF LANCASTER, OHIO.

GUARD FOR CUTTER-HEADS.

SPECIFICATION forming part of Letters Patent No. 337,493, dated March 9, 1886,

Application filed December 10, 1885. Serial No. 185,237. (No model.)

To all whom it may concern.-

Be it known that I, ISAAC E. HALL, a citizen of the United States, residing at Lancaster, in the county ofFairfield and State of Ohio, have invented certain new and useful Improvements in Guards for Shaping or Frizzing WVood-VVorking Machines; and I do declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to guards for cutterheads, its object being to combine with the mandrel of such cutter-head a shield or guard directly supported on said mandrel and made adjustable longitudinally thereon, to uncover or cover so much of the cutters as occasion may require, by interposing interchangeable washers of varying thicknesses between the cutter-head and the guard.

It consists in the novel features more fully hereinafter set forth, and particularly claimed.

In the drawings, Figure l is a view in elevation of a cutter-head and its mandrel en1 bodying my invention. Fig. Zisalongitudinal section. Fig. 3 is a top plan of the shield. Fig. 4 is a longitudinal section of a modified form of the shield.

The mandrelA has areduced end, a, which isthreaded for a slight distance from its extremity. A cutter-head, B, of any known construction, is supported on and keyed to the mandrel. This cutter-head rests against the shoulder a, formed between the enlarged and reduced portion of the mandrel, and consists of an upper and lower disk, 0 0, respectively, between which cutters D are secured, preferably by seating their ends in grooves d, formed on each disk, and held in place by clamping the disks thereon. The

shield E is cylindrical in form, open at one end and closed at the other, which is centrally apertnred to correspond with and permit the passage of the reduced end of the mandrel. The cylindrical portion is of a size to fit over the cutter-head. Washers F of varying thick ness are provided, and are interposed between the cutter-head and the inner side of the closed end of the shield, thereby adjusting the same longitudinally on the mandrel, a washer of the required thickness being used for the proper adjustment.

In order that the washers not in use may be at hand, the reduced end of the mandrel is extended, and such washers slipped thereon. A nut, G, serves to secure the parts in place.

To prevent the choking of the cutter-head or shield, and permit a circulation of air to keep the parts cool, the closed end of the shield or guard is perforated at e.

NVhile the washers are preferred for the adjustment of the guard, it is evident that va rious means may be employed. For instance, as shown in Fig. 4, the closed end of a shield has a boss surrounding its central opening, which boss is annularly grooved, as atf. A nut, H, has an enlarged portion, h, to fit over the boss, and a set-screw or stop, I, projecting inwardly from the part h, engages the groovefin the boss. By turning the nut to the right or left it is obvious that the guard is moved to or from the cutter-head, a set-screw, J, being used to hold the guard at its proper adjustment. Another and simpler waywould be to thread the interior-of the boss of the guard to correspond with the thread of the reduced end of the mandrel, the adjustment being effected by turning the guard itself, thesame being held, when adjusted, by a setscrew. I

The operation of my improvement is manifest from the foregoing, and its advantages apparent to those skilled in the art to which my invention appertains.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The. combination, with the mandrel, the cutter-head, and the guard, of interchangeable washers of varying thicknesses interposed between the crown of the cutter-head and the base of the guard, to adjust the latter longiter-head, substantially as set forth.

2. The combination of the mandrel, the outmandrel, substantia lly as and for the purposes ter-head mounted thereon, a guard adjustaspecified. 1o bly supported on the mandrel to rotate there In testimony whereof I affix my signature in with, and interchangeable Washers of varying presence of two Witnesses.

5 thicknesses, to be inserted between the crown ISAAC 1?. HALL.

of the cutter-head and the base of the guard, Witnesses: to effect the adj ustmcnt of the letter, said WM. H. BECK,

washers being mounted on an extension of the G. N. MCGLEERY. 

